Thin Film High-Temperature Superconducting Flux Transformers Coupled to SQUIDs

  • F. C. Wellstood
  • A. H. Miklich
  • J. J. Kingston
  • M. J. Ferrari
  • J. Clarke
  • M. S. Colclough
  • K. Char
  • G. Zaharchuk
Conference paper
Part of the Springer Proceedings in Physics book series (SPPHY, volume 64)

Abstract

Using photolithographic patterning and laser deposition, we have constructed a sensitive thin-film SQUID magnetometer from YBa2Cu3O7−x (YBCO). The device consists of a flux transformer, deposited on one substrate, which is coupled to a thin-film YBCO SQUID, made with bi-epitaxial junctions, deposited on another substrate. At 77K, the magnetometer has attained a sensitivity of 1.8pTHz−1/2 at 1Hz, and has been used to measure the magnetic signal from the human heart.

Keywords

Vortex Attenuation Cage Milling Sapphire 

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References

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Copyright information

© Springer-Verlag Berlin Heidelberg 1992

Authors and Affiliations

  • F. C. Wellstood
    • 1
    • 2
  • A. H. Miklich
    • 1
    • 2
  • J. J. Kingston
    • 1
    • 2
  • M. J. Ferrari
    • 1
    • 2
  • J. Clarke
    • 1
    • 2
  • M. S. Colclough
    • 3
  • K. Char
    • 3
  • G. Zaharchuk
    • 3
  1. 1.Department of PhysicsUniversity of CaliforniaBerkeleyUSA
  2. 2.Lawrence Berkeley LaboratoryBerkeleyUSA
  3. 3.Conductus Inc.SunnyvaleUSA

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